blob: dc0cec784064abf101a6624fa1e68a654d2327ea (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
//===========================================================================
//chapter 10 example 2
clc;clear all;
//variable declaration
RA = 2.5; //resistance of ammeter Ω
RV = 6000; //resistance of voltmeter Ω
V = 38.4; //voltage in V
I = 0.4; //current in A
//calculations
Rx = sqrt(RA*RV); //value of unknown resisitance in Ω
Rm = V/I; //measured value of unknown resistance in Ω
Rx1 = V/(I*(1-(V/(I*RV)))); //true value of unknown resistance in Ω
EA = (1/2)*(1/100)*1; //error on ammeter reading in A
EV = (1/2)*(50/100); //error on voltmeter reading in V
PEA = (EA/I)*100; //percentage error at 0.4 A reading in %
PEV = (EV/V)*100; //percentage error at 38.4 A reading in %
E = sqrt((PEA^2)+(PEV^2)); //error due to ammeter and voltmeter in %
AE = (E/100)*Rx1; //absolute error due to ammeter and voltmeter in Ω
R1 =Rx1+AE; //resistance in Ω
R2 = Rx1-AE; //resistance in Ω
//result
mprintf("resistance is specified as %3.3f and %3.3f Ω",R1,R2);
|
